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Old 05-24-2014, 04:21 PM   #1
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E1 error on my AC

Hi. My AC was working fine and now the thermostat flashes between E1 error code and the last temperature setting. Neither the AC or the furnace is working. We have checked all the connections inside and replaced the thermostat with no success. I have read this code means loss of communication but how do we fix this. We have a 2012 Lacross RES. Thanks for any help!

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Old 05-24-2014, 04:57 PM   #2
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Hi. My AC was working fine and now the thermostat flashes between E1 error code and the last temperature setting. Neither the AC or the furnace is working. We have checked all the connections inside and replaced the thermostat with no success. I have read this code means loss of communication but how do we fix this. We have a 2012 Lacross RES. Thanks for any help!

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I would at least try to shut off the Circuit breaker and battery DC and then turn back on and see what you get. This may be all you need to reset the error.
Good luck.
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Old 05-24-2014, 05:53 PM   #3
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Do we re- hook the battery before we turn the ac back on or not?


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Old 05-24-2014, 05:55 PM   #4
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Do we re- hook the battery before we turn the ac back on or not?


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YES you need both AC and DC power ON
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Old 05-24-2014, 06:14 PM   #5
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Thanks we will try that

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Old 05-25-2014, 08:13 AM   #6
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No luck. Same error code

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Old 05-25-2014, 08:32 AM   #7
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It's my understanding that an E1 flashing code indicates the thermostat has lost its memory. Remove the thermostat and check for loose terminals. More often than not a new thermostat is required. Evidently continued use of your system with the code flashing will not harm the system.
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Old 05-25-2014, 10:15 AM   #8
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Thanks bubbles. We have replaced the Tstat all ready with no luck. We are going to keep trying. The air/ furnace will not even come on

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Old 05-30-2014, 08:44 AM   #9
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I had this happen with the 2nd AC on my Sanibel a year ago. I checked the unit on the roof and found no 120vac (without power there is no communication). I found a loose wire connection at the CB panel. Repaired that and all has been good since.
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Old 05-30-2014, 09:31 AM   #10
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Right from dometic.


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